Redcentric plc's (LON:RCN) price-to-earnings (or "P/E") ratio of 27.3x might make it look like a strong sell right now compared to the market in the United Kingdom, where around half of the companies have P/E ratios below 13x and even P/E's below 7x are quite common. Although, it's not wise to just take the P/E at face value as there may be an explanation why it's so lofty.

While the market has experienced earnings growth lately, Redcentric's earnings have gone into reverse gear, which is not great. It might be that many expect the dour earnings performance to recover substantially, which has kept the P/E from collapsing. If not, then existing shareholders may be extremely nervous about the viability of the share price.

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Does Growth Match The High P/E?

There's an inherent assumption that a company should far outperform the market for P/E ratios like Redcentric's to be considered reasonable.

Retrospectively, the last year delivered a frustrating 26% decrease to the company's bottom line. At least EPS has managed not to go completely backwards from three years ago in aggregate, thanks to the earlier period of growth. Accordingly, shareholders probably wouldn't have been overly satisfied with the unstable medium-term growth rates.

Looking ahead now, EPS is anticipated to slump, contracting by 75% during the coming year according to the only analyst following the company. With the market predicted to deliver 9.9% growth , that's a disappointing outcome.

In light of this, it's alarming that Redcentric's P/E sits above the majority of other companies. Apparently many investors in the company reject the analyst cohort's pessimism and aren't willing to let go of their stock at any price. There's a very good chance these shareholders are setting themselves up for future disappointment if the P/E falls to levels more in line with the negative growth outlook.

What We Can Learn From Redcentric's P/E?

Using the price-to-earnings ratio alone to determine if you should sell your stock isn't sensible, however it can be a practical guide to the company's future prospects.

We've established that Redcentric currently trades on a much higher than expected P/E for a company whose earnings are forecast to decline. Right now we are increasingly uncomfortable with the high P/E as the predicted future earnings are highly unlikely to support such positive sentiment for long. This places shareholders' investments at significant risk and potential investors in danger of paying an excessive premium.